Most of the attention in the sport psychology domain is given to advanced and elite adult players. In an ideal world, squash coaches would start to guide their proteges towards mental toughness at the very start of their squash lives.
In the early 1990’s I helped Tennis Canada develop mental training and sport psychology priorities for every age group in their junior tennis programs: periodized annual mental training programs to be implemented in Canadian indoor clubs for each of their junior age groups: U11, U14, U18.
At each stage of development, different psychological qualities were prioritized – for example tennis intelligence, courage, leadership, etc. In effect what we did was develop psychological specifics what we would now describe as stages of a Long Term Athlete Development Plan (LTAD).
While many of the technical and physical aspects of published LTADs are very concrete and specific, the psychological aspects tend to be general and vague – reason being that the sport scientists developing the LTADs work primarily in the areas of physiology and motor learning – not sport psychology!
Here is a link to great example of mental training for beginning tennis players – which will apply 100% to beginning squash players – thanks International Tennis Federation (ITF)!